Captain Francesco Schettino is being investigated for suspected manslaughter, causing a shipwreck and abandoning the vessel before all its passengers were evacuated

Traces of cocaine have reportedly been found on the exterior of a hair sample from Costa Concordia captain Francesco Schettino.

Lawyers for survivors of the tragedy are pressing for new drug tests to be carried out on Schettino after the initial results were published this weekend.

Italian consumer protection group Codacons, which is representing some of the survivors, said traces of the drug were found on a hair sample and in an envelope containing the sample, but noted a urine sample and analysis of the hair did not yield evidence of cocaine.

It called the findings “very strange” and said it had requested new testing to see if the samples might have been contaminated, AP said.

Usual signs of cocaine use include the presence of the drug within the hair or urine. That traces were found on the captain’s hair indicate he may have been around the drug, although not used it himself.

Questions have been asked about the behaviour of Schettino, who was captaining the Costa Concordia when it crashed into rocks, killing 17 people.

Footage broadcast on Italy’s TG5 news revealed the captain on the bridge of the luxury liner, speaking on the telephone and seemingly oblivious to the confusion around him.

Crew members were heard pressurising the 52-year-old to officially evacuate the vessel as they begin to don life jackets in panic.

One officer was heard shouting “What do we do?” as Schettino calmly continued his conversation, the Independent reported.

Around three quarters of an hour before the official “abandon ship” orders are given, one official was heard to say “Passengers are getting into the life boats on their own”, to which a man believed to be Schettino replies “vabbuo”, which translates as “whatever”.

The captain refused to give the official orders to abandon ship for a further 15 minutes, a delay which experts say cost many their lives.

TG5 news has handed the footage over to Italian investigators.

Schettino was commanding the ship, carrying 4,200 people, of which 15 are still missing, when it ran aground off the Tuscan coast on 13 January.

He is being investigated for suspected manslaughter, causing a shipwreck and abandoning the vessel before all its passengers were evacuated.

Schettino has remained under house arrest since the incident and the ship remains partially submerged off the coast of Giglio.

The married father-of-one is also mired in a romantic controversy after he was reportedly spotted drinking and dining with a 25-year-old blonde dancer just before the shipwreck.

Domnica Cemortan has been linked to Schettino as far back as a month before the tragedy, after a picture of the pair enjoying a meal of oysters emerged in Italian gossip magazine Chi.

A fortnight ago, Cemortan reportedly told investigators she was “in love” with the 52-year-old. The 24-year-old had initially denied any romantic involvement with him, but reportedly admitted her feelings after divers found her lingerie in his cabin.

Other items of her clothing and a makeup bag were also found among his belongings, the Times said.

She reportedly told them: "I was on the bridge because I was in love with the captain. I found him charming and fascinating. I love him.

"I was on the bridge as his guest. It's not right that his image is being destroyed."

But in an interview with Oggi magazine published earlier this month, she denied the claims.

She said: "They are all lies. I wasn't born yesterday. The information was put out to put pressure on the captain. They want to isolate him, even from his family.

"I never said to magistrates 'I love Schettino'. They say they've found my bikini in his cabin. What have they found on this bikini that connects it to me? Was my name written on it, was there my photograph, or my DNA?"

Officials plan to remove about 500,000 gallons (2,400 tons) of heavy fuel from the Costa Concordia wreckage, but that has been delayed by rough seas and bad weather.

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View of the Costa Concordia taken on January 14, 2012, after the cruise ship ran aground and keeled over off the Isola del Giglio, last night. Three people died and about 70 were missing Saturday after an Italian cruise ship with more than 4,000 people on board ran aground and keeled over, sparking scenes of panic. AFP PHOTO/FILIPPO MONTEFORTE

View of the Costa Concordia on January 14, 2012, after the cruise ship ran aground and keeled over off the Isola del Giglio, last night. Three people died and about 70 were missing after an Italian cruise ship with more than 4,000 people on board ran aground and keeled over, sparking scenes of panic. FILIPPO MONTEFORTE/AFP/Getty Images

View of the Costa Concordia taken on January 14, 2012, after the cruise ship ran aground and keeled over off the Isola del Giglio, last night. Three people died and about 70 were missing Saturday after an Italian cruise ship with more than 4,000 people on board ran aground and keeled over, sparking scenes of panic. AFP PHOTO/FILIPPO MONTEFORTE

View of the Costa Concordia on January 14, 2012, after the cruise ship ran aground and keeled over off the Isola del Giglio, last night. Three people died and several were missing after the ship with more than 4,000 people on board ran aground sparking chaos as passengers scrambled to get off. AFP PHOTO / FILIPPO MONTEFORTE

View of the Costa Concordia on January 14, 2012, after the cruise ship ran aground and keeled over off the Isola del Giglio, last night. Three people died and several were missing after the ship with more than 4,000 people on board ran aground sparking chaos as passengers scrambled to get off. AFP PHOTO / FILIPPO MONTEFORTE

View of the Costa Concordia on January 14, 2012, after the cruise ship ran aground and keeled over off the Isola del Giglio, last night. Three people died and several were missing after the ship with more than 4,000 people on board ran aground sparking chaos as passengers scrambled to get off. The ship was on a cruise in the Mediterranean, leaving from Savona with planned stops in Civitavecchia, Palermo, Cagliari, Palma, Barcelona and Marseille,' the company said. AFP PHOTO / FILIPPO MONTEFORTE

Passengers of the Costa Concordia arrive at Porto Santo Stefano on January 14, 2012, after being evacuated from the cruise ship that ran aground and keeled over off the Isola del Giglio, last night. AFP PHOTO / FILIPPO MONTEFORTE

Passengers of the Costa Concordia arrive at Porto Santo Stefano on January 14, 2012, after being evacuated from the cruise ship that ran aground and keeled over off the Isola del Giglio, last night. AFP PHOTO / FILIPPO MONTEFORTE

The luxury cruise ship Costa Concordia leans on its side as after running aground off the tiny Tuscan island of Giglio, Italy, Saturday, Jan. 14, 2012.

This aerial video image taken from a helicopter and released by the Italian Guardia di Finanza (Border Police) shows the luxury cruise ship Costa Concordia as it lays on its side. AP Photo/Italian Guardia di Finanza Border Police

Passengers of the Costa Concordia arrive at Porto Santo Stefano on January 14, 2012, after being evacuated from the cruise ship that ran aground and keeled over off the Isola del Giglio, last night. AFP PHOTO / FILIPPO MONTEFORTE

Passengers of the Costa Concordia arrive at Porto Santo Stefano on January 14, 2012, after being evacuated from the cruise ship that ran aground and keeled over off the Isola del Giglio, last night. AFP PHOTO / FILIPPO MONTEFORTE

A photograph taken on January 14, 2012 of the Costa Concordia after the cruise ship with more than 4,000 people on board ran aground and keeled over off the Isola del Giglio, and Italian island, last night. AFP PHOTO / STRINGER

The luxury cruise ship Costa Concordia leans on its starboard side as seen from the Giglio harbor, after running aground off the tiny Tuscan island of Giglio, Italy, Saturday, Jan. 14, 2012. (AP Photo/Gregorio Borgia)

Crowds gather on the island of Giglio, where passengers aboard the cruise ship Costa Concordia have been staying after the vessel ran aground, on January 14, 2012 in Giglio Porto, Italy. (Laura Lezza/Getty Images)

Crowds gather on the island of Giglio, where passengers aboard the cruise ship Costa Concordia have been staying after the vessel ran aground, on January 14, 2012 in Giglio Porto, Italy. More than four thousand people were on board when the ship hit a sandbank. At least 3 people have been confirmed dead and another 50 are unaccounted for. (Laura Lezza/Getty Images)

Crowds gather on the island of Giglio, where passengers aboard the cruise ship Costa Concordia have been staying after the vessel ran aground, on January 14, 2012 in Giglio Porto, Italy. More than four thousand people were on board when the ship hit a sandbank. At least 3 people have been confirmed dead and another 50 are unaccounted for. (Laura Lezza/Getty Images)

A general view of the scene on the island of Giglio, near to where the cruise ship Costa Concordia ran aground, on January 14, 2012 in Giglio Porto, Italy. More than four thousand people were on board when the ship hit a sandbank. At least 3 people have been confirmed dead and another 50 are unaccounted for. (Laura Lezza/Getty Images)

View of the Costa Concordia on January 14, 2012, after the cruise ship ran aground and keeled over off the Isola del Giglio, last night. Three people died and several were missing after the ship with more than 4,000 people on board ran aground sparking chaos as passengers scrambled to get off. AFP PHOTO / FILIPPO MONTEFORTE